[ClusterLabs] Antw: Re: Antw: [EXT] Re: Antw: Hanging OCFS2 Filesystem any one else?

[Ulrich Windl]

Hi!

can you give some details on what is necessary to trigger the problem?
(I/O load, CPU load, concurrent operations on one node or on multiple nodes,
using reflink snapshots, using ioctl(FS_IOC_FIEMAP), etc.)

Regards,
Ulrich

>>> Gang He <GHe at suse.com> schrieb am 11.07.2021 um 10:55 in Nachricht
<AM6PR04MB648817316DB7B124F414D60ACF169 at AM6PR04MB6488.eurprd04.prod.outlook.com>

> Hi Ulrich,
> 
> Thank for your update.
> Based on some feedback from the upstream, there is a patch (ocfs2: 
> initialize ip_next_orphan), which should fix this problem.
> I can comfirm the patch looks very similar with your problem.
> I will verify it next week, then let you know the result.
> 
> Thanks
> Gang
> 
> ________________________________________
> From: Users <users‑bounces at clusterlabs.org> on behalf of Ulrich Windl 
> <Ulrich.Windl at rz.uni‑regensburg.de>
> Sent: Friday, July 9, 2021 15:56
> To: users at clusterlabs.org 
> Subject: [ClusterLabs] Antw: [EXT] Re: Antw: Hanging OCFS2 Filesystem any 
> one else?
> 
> Hi!
> 
> An update on the issue:
> SUSE support found out that the reason for the hanging processes is a 
> deadlock caused by a race condition (Kernel 5.3.18‑24.64‑default). Support
is 
> working on a fix.
> Today the cluster "fixed" the problem in an unusual way:
> 
> h19 kernel: Out of memory: Killed process 6838 (corosync) total‑vm:261212kB,

> anon‑rss:31444kB, file‑rss:7700kB, shmem‑rss:121872kB
> 
> I doubt that was the best possible choice ;‑)
> 
> The dead corosync caused the DC (h18) to fence h19 (which was successful), 
> but the DC was fenced while it tried to recover resources, so the complete 
> cluster rebooted.
> 
> Regards,
> Ulrich
> 
> 
> 
> 
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